Quarterly report pursuant to Section 13 or 15(d)

INVESTMENT SECURITIES AND OTHER SECURITIES - Schedule of Amortized Cost, Fair Value, and Gross Unrealized Gains and Losses (Details)

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INVESTMENT SECURITIES AND OTHER SECURITIES - Schedule of Amortized Cost, Fair Value, and Gross Unrealized Gains and Losses (Details) - USD ($)
Sep. 30, 2021
Dec. 31, 2020
Available-for-sale securities:    
Total available-for-sale securities $ 25,653,000,000 $ 16,175,000,000
Gross Gains 212,000,000 344,000,000
Gross Losses (211,000,000) (34,000,000)
Fair Value 25,654,000,000 16,485,000,000
Held-to-maturity securities:    
Total held-to-maturity securities 12,455,000,000 8,861,000,000
Gross Gains 202,000,000 394,000,000
Gross Losses (38,000,000) 0
Fair Value 12,619,000,000 9,255,000,000
Other securities, cost 649,000,000 417,000,000
Other securities, fair value 649,000,000 418,000,000
Equity Securities, FV-NI, Accumulated Gross Unrealized Gain, before Tax 0 1,000,000
Equity Securities, FV-NI, Accumulated Gross Unrealized Loss, before Tax 0 0
Available-for-sale Securities [Member]    
Held-to-maturity securities:    
Financing Receivable, Accrued Interest, before Allowance for Credit Loss 60,000,000 32,000,000
Held-to-maturity Securities [Member]    
Held-to-maturity securities:    
Financing Receivable, Accrued Interest, before Allowance for Credit Loss 26,000,000 20,000,000
U.S. Treasury    
Available-for-sale securities:    
Total available-for-sale securities 5,000,000 5,000,000
Gross Gains 0 0
Gross Losses 0 0
Fair Value 5,000,000 5,000,000
Residential CMO    
Available-for-sale securities:    
Total available-for-sale securities 3,683,000,000 3,550,000,000
Gross Gains 63,000,000 121,000,000
Gross Losses (12,000,000) (5,000,000)
Fair Value 3,734,000,000 3,666,000,000
Held-to-maturity securities:    
Total held-to-maturity securities 2,701,000,000 1,779,000,000
Gross Gains 56,000,000 88,000,000
Gross Losses (4,000,000) 0
Fair Value 2,753,000,000 1,867,000,000
Residential MBS    
Available-for-sale securities:    
Total available-for-sale securities 14,413,000,000 7,843,000,000
Gross Gains 47,000,000 97,000,000
Gross Losses (123,000,000) (5,000,000)
Fair Value 14,337,000,000 7,935,000,000
Held-to-maturity securities:    
Total held-to-maturity securities 7,079,000,000 3,715,000,000
Gross Gains 62,000,000 103,000,000
Gross Losses (33,000,000) 0
Fair Value 7,108,000,000 3,818,000,000
Commercial MBS    
Available-for-sale securities:    
Total available-for-sale securities 1,522,000,000 1,151,000,000
Gross Gains 11,000,000 21,000,000
Gross Losses (35,000,000) (9,000,000)
Fair Value 1,498,000,000 1,163,000,000
Held-to-maturity securities:    
Total held-to-maturity securities 2,468,000,000 3,118,000,000
Gross Gains 77,000,000 191,000,000
Gross Losses (1,000,000) 0
Fair Value 2,544,000,000 3,309,000,000
Other agencies    
Available-for-sale securities:    
Total available-for-sale securities 263,000,000 60,000,000
Gross Gains 1,000,000 2,000,000
Gross Losses 0 0
Fair Value 264,000,000 62,000,000
Held-to-maturity securities:    
Total held-to-maturity securities 205,000,000 246,000,000
Gross Gains 7,000,000 12,000,000
Gross Losses 0 0
Fair Value 212,000,000 258,000,000
Total U.S. Treasury, federal agency and other agency securities    
Available-for-sale securities:    
Total available-for-sale securities 19,886,000,000 12,609,000,000
Gross Gains 122,000,000 241,000,000
Gross Losses (170,000,000) (19,000,000)
Fair Value 19,838,000,000 12,831,000,000
Held-to-maturity securities:    
Total held-to-maturity securities 12,453,000,000 8,858,000,000
Gross Gains 202,000,000 394,000,000
Gross Losses (38,000,000) 0
Fair Value 12,617,000,000 9,252,000,000
Municipal securities    
Available-for-sale securities:    
Total available-for-sale securities 3,570,000,000 2,928,000,000
Gross Gains 82,000,000 91,000,000
Gross Losses (18,000,000) (15,000,000)
Fair Value 3,634,000,000 3,004,000,000
Held-to-maturity securities:    
Total held-to-maturity securities 2,000,000 3,000,000
Gross Gains 0 0
Gross Losses 0 0
Fair Value 2,000,000 3,000,000
Private-label CMO    
Available-for-sale securities:    
Total available-for-sale securities 120,000,000 9,000,000
Gross Gains 0 0
Gross Losses 0 0
Fair Value 120,000,000 9,000,000
Asset-backed securities    
Available-for-sale securities:    
Total available-for-sale securities 284,000,000 185,000,000
Gross Gains 3,000,000 7,000,000
Gross Losses (2,000,000) 0
Fair Value 285,000,000 192,000,000
Corporate debt    
Available-for-sale securities:    
Total available-for-sale securities 1,789,000,000 440,000,000
Gross Gains 5,000,000 5,000,000
Gross Losses (21,000,000) 0
Fair Value 1,773,000,000 445,000,000
Other securities/Sovereign debt    
Available-for-sale securities:    
Total available-for-sale securities 4,000,000 4,000,000
Gross Gains 0 0
Gross Losses 0 0
Fair Value 4,000,000 4,000,000
Mutual funds    
Held-to-maturity securities:    
Other securities, cost 62,000,000 50,000,000
Other securities, fair value 62,000,000 50,000,000
Equity Securities, FV-NI, Accumulated Gross Unrealized Gain, before Tax 0 0
Equity Securities, FV-NI, Accumulated Gross Unrealized Loss, before Tax 0 0
Equity securities    
Held-to-maturity securities:    
Other securities, cost 24,000,000 8,000,000
Other securities, fair value 24,000,000 9,000,000
Equity Securities, FV-NI, Accumulated Gross Unrealized Gain, before Tax 0 1,000,000
Equity Securities, FV-NI, Accumulated Gross Unrealized Loss, before Tax 0 0
Federal Home Loan Bank stock | Non-marketable equity securities:    
Held-to-maturity securities:    
Other securities, cost 52,000,000 60,000,000
Other securities, fair value 52,000,000 60,000,000
Equity Securities, FV-NI, Accumulated Gross Unrealized Gain, before Tax 0 0
Equity Securities, FV-NI, Accumulated Gross Unrealized Loss, before Tax 0 0
Federal Reserve Bank stock | Non-marketable equity securities:    
Held-to-maturity securities:    
Other securities, cost 511,000,000 299,000,000
Other securities, fair value 511,000,000 299,000,000
Equity Securities, FV-NI, Accumulated Gross Unrealized Gain, before Tax 0 0
Equity Securities, FV-NI, Accumulated Gross Unrealized Loss, before Tax $ 0 $ 0